To me the biggest selling point of Avenue 24 is the fact that's open 24/7. After a long night out at Mandalay Bay, I was exhausted and hungry by the time I got back to the MGM Grand at 3am. This was the first place we saw in the casino that was still open, so we stopped in to refuel.
At 3am, as you can imagine, it's pretty empty. Service was fine and the food was good enough. Be prepared to shell out some money, though, like all places on the Strip. If you're looking for some cheap eats, this is not the place for you. But for a quick meal at 3am, who cares! I paid $10 for a pretzel and $15 for some omelet thing for my partner. I didn't care.